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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da85d5d27cadb80c6210a7cd3dc1d3e0226ce392a7d33334067cbdc923f4f1a3' 
  AND token = 'AIw2EzYMWV+ivlyOMRU16f7NirbVNPQS/G2orKfReAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}